Rough SERS substrate based on gold coated porous silicon layer prepared on the silicon backside surface

Dridi, Hamida; Haji, Lazhar; Moadhen, A.

doi:10.1016/j.spmi.2017.02.002

Cited by 14 publications

(15 citation statements)

References 26 publications

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“…Figure 3 illustrates the comparative SERS intensities of R6G molecules (10 −5 mol/L) obtained on PS PC samples. The typical bands of R6G were observed at 612, 772, 1087, 1127, 1189, 1312, 1363, 1509, and 1651 cm −1 in the first four cases, which were well indexed to the C–C in-plane bending in xanthene rings, C–H out-of-plane bending, C–H in-plane flexural stretching vibration, C–H out-of-plane vibration in xanthene rings, hybrid-mode associated with the NHC 2 H 5 group and xanthene rings, and C–C ring stretching to xanthene rings, respectively [ 19 , 37 ]. When the deposition time/immersing time exceeded 90 s, it was difficult to observe the Raman peaks of R6G because the layer of AgNPs was too thick, which hindered the electromagnetic interaction between Si and AgNPs [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

“…Over the last few decades, owing to its unique optical and physical characteristics, porous Si has been widely used as sensors, such as biological sensors [ 15 ], electrochemical sensors [ 16 ], and optical sensors [ 17 , 18 ]. Among these, SERS-based sensors have received much attention from researchers [ 18 , 19 , 20 ]. The Raman enhancement effect in these sensors, which depends largely on the type and morphology of SERS substrate, can be attributed to electromagnetic (EM) and chemical mechanisms (CM) [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, many researchers have improved upon and optimized the substrate structure to obtain more and stronger electromagnetic hotspots by using sharp edges or tips and porous nanoparticles of these noble metals [ 3 , 22 ]. For example, porous Si coated with Au/Ag nanoparticles has been reported to obtain excellent SERS performance [ 1 , 19 ]. However, most researchers focus on the main SERS effect of single-layer porous Si structures; on the other hand, sensors based on the SERS effect of porous Si photonic crystals are still rarely reported.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Zhong

Guo

et al. 2018

Nanomaterials

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Picric acid (PA) is an organic substance widely used in industry and military, which poses a great threat to the environment and security due to its unstable, toxic, and explosive properties. Trace detection of PA is also a challenging task because of its highly acidic and anionic character. In this work, silver nanoparticles (AgNPs)-decorated porous silicon photonic crystals (PS PCs) were controllably prepared as surface-enhanced Raman scattering (SERS) substrates using the immersion plating solution. PA and Rhodamine 6G dye (R6G) were used as the analyte to explore the detection performance. As compared with single layer porous silicon, the enhancement factor of PS PCs substrates is increased to 3.58 times at the concentration of 10−6 mol/L (R6G). This additional enhancement was greatly beneficial to the trace-amount-detection of target molecules. Under the optimized assay condition, the platform shows a distinguished sensitivity with the limit of detection of PA as low as 10−8 mol/L, the linear range from 10−4 to 10−7 mol/L, and a decent reproducibility with a relative standard deviation (RSD) of ca. 8%. These results show that the AgNPs-modified PS PCs substrates could also find further applications in biomedical and environmental sensing.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Zhong

Guo

et al. 2018

Nanomaterials

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“…Plasmonic metallic nanostructures can be formed on porous silicon by different ways such as thermal decomposition [ 17 , 35 , 75 ], immersion deposition [ 74 , 77 , 83 , 89 , 92 , 93 ], deposition from colloids [ 64 , 68 , 94 ], evaporation [ 34 , 37 ], sputtering [ 36 , 37 , 53 ], physical vapor deposition (PVD) [ 95 , 96 , 97 ], pulsed laser deposition (PLD) [ 68 , 98 ], chemical deposition [ 99 ], and electrochemical plating [ 16 , 52 , 69 ]. However, here, we will only describe immersion deposition and thermal decomposition in detail.…”

Section: Approaches For Coating Porous Silicon With Metals For Sermentioning

confidence: 99%

Progress in the Development of SERS-Active Substrates Based on Metal-Coated Porous Silicon

et al. 2018

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The present work gives an overview of the developments in surface-enhanced Raman scattering (SERS) with metal-coated porous silicon used as an active substrate. We focused this review on the research referenced to SERS-active materials based on porous silicon, beginning from the patent application in 2002 and enclosing the studies of this year. Porous silicon and metal deposition technologies are discussed. Since the earliest studies, a number of fundamentally different plasmonic nanostructures including metallic dendrites, quasi-ordered arrays of metallic nanoparticles (NPs), and metallic nanovoids have been grown on porous silicon, defined by the morphology of this host material. SERS-active substrates based on porous silicon have been found to combine a high and well-reproducible signal level, storage stability, cost-effective technology and handy use. They make it possible to identify and study many compounds including biomolecules with a detection limit varying from milli- to femtomolar concentrations. The progress reviewed here demonstrates the great prospects for the extensive use of the metal-coated porous silicon for bioanalysis by SERS-spectroscopy.

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“…Moreover, the uniform roughness of SERS substrates is another important characteristic. Rough SERS substrates will improve SERS activity due to the enlargement of the surface area and generation of more hot spots [20]. Among several surface roughening methods, nanosphere self-assembly has been considered as a favorable method.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Characterization, and Application of Large-Scale Uniformly Hybrid Nanoparticle-Enhanced Raman Spectroscopy Substrates

Liu

et al. 2019

Micromachines

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Surface-enhanced Raman spectroscopy (SERS) substrates with high sensitivity and reproducibility are highly desirable for high precision and even molecular-level detection applications. Here, large-scale uniformly hybrid nanoparticle-enhanced Raman spectroscopy (NERS) substrates with high reproducibility and controllability were developed. Using oxygen plasma treatment, large-area and uniformly rough polystyrene sphere (URPS) arrays in conjunction with 20 nm Au films (AuURPS) were fabricated for SERS substrates. Au nanoparticles and clusters covered the surface of the URPS arrays, and this increased the Raman signal. In the detection of malachite green (MG), the fabricated NERS substrates have high reproducibility and sensitivity. The enhancement factor (EF) of Au nanoparticles and clusters was simulated by finite-difference time-domain (FDTD) simulations and the EF was more than 104. The measured EF of our developed substrate was more than 108 with a relative standard deviation as low as 6.64%–13.84% over 15 points on the substrate. The minimum limit for the MG molecules reached 50 ng/mL. Moreover, the Raman signal had a good linear relationship with the logarithmic concentration of MG, as it ranged from 50 ng/mL to 5 μg/mL. The NERS substrates proposed in this work may serve as a promising detection scheme in chemical and biological fields.

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Rough SERS substrate based on gold coated porous silicon layer prepared on the silicon backside surface

Cited by 14 publications

References 26 publications

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Porous Silicon Photonic Crystals Coated with Ag Nanoparticles as Efficient Substrates for Detecting Trace Explosives Using SERS

Progress in the Development of SERS-Active Substrates Based on Metal-Coated Porous Silicon

Fabrication, Characterization, and Application of Large-Scale Uniformly Hybrid Nanoparticle-Enhanced Raman Spectroscopy Substrates

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